just installed a set of dunlop winter sport m3 dsst runflats (225/45 HR-17) and ASA AR1 17x8 black w/ machined lip w/ offset of 40mm. now the back wheels look "sunk in". i assumed that's because the 161s i had in the back were 255. is installing spacers the way to correct it? what size spacers will i need? do i need to correct the front wheels also? (i just want it to look like the way w/ the 161s w/ the sport package. i want the "outside" track width to be the same as before and i am not looking for an extra aggressive stance, if that makes sense.)

i read through all the threads related to spacers, i haved tried using the wheel offset calculator, but i don't quite understand how to use it and i still have no idea what i will need. any help on figuring out the spacer size i need is appreciated.

btw, i finally posted pictures of my car. i picked up my car back in 7/05 but i have been too busy driving it.